Carburetor



June 7, 1932. F. w. SCHAFFNER CARBURETOR Filed Sept. 5, 1931 3 Shets-Sheet 1 J 7, 1932-v E. w. SCHAFFNER CARBURETOR Filed Sept. 3, 1931 5 Sheets-Sheet 2 r INVENTOR I ATTORNEY5 JIme 7 1932- F. w. SCHAFFNER CARBURETOR Filed Sept. s. 1931 3 Sheets-Sheet 3 ATTOR N EYS Patented June 7, 1932 PATENT OFFICE FREDERIGK W. SCHAFFNER, OIE BROOKLYN, NEW YORK CABB'U'RETOB Application filed September 3, 1931. Seriell N0. 561,068.

Tl1is invention relates. t carburetors f01 internal combust-ion engines and has for the primary object, the provision 0f a device of the above stated character wl1icl1 Will increase the efliciency of a cohventional t vpe of engine, as to power and 1nileage derived from a given amount of fuel and acceleration and smoothness of operation.

Another object of this invention is the provision of a carburetor which will thoroughly mix fuel and air in proper proportion t0 insure maximum power from a minimum consumption 0f fuel and delixer to the firing chambers of the engine the fuel in a highl vaporized col1diti'on so that the possibility of liquefied fuel entering the engine is obviated thereb v retarding the accumulation 0f carb0n ancl dilution of the lubricant of the engine, so tl1at the operation 0f the engine will be raised to the highestdegree 0f elficiency and reduce the maintenance and the operation of the engine to a minimum.

A further object of this im ention is the provision of an improved means for regulating both the fuel and air to a mixing cl1amber in accordance witl1 the opening and clos ing of the throttle valve so that the most volatile fuel possible will enter the engine.

A further object of this invention is the provision of an adjustable 'double valve for the air supply medium to the mixing chamher for automatically increasing and decrezising the supply of air in accordance with the suction 0f the engine to provide an increasefl officiency of accele'ration and smoothness f operation of the engine and provide more power from a qiven amountof.fuel.

A further object of' this invention is the Provision of n auxiliary air supply t0 the.

mixing chamber having a control medium simultaneously operated with the control means of the auxiliary chamber so thatas the supply 0f fl 1el is increased t0 the engine additiohal air may be admitted givinggreater 'power and more efficiency of operation.

A still further object of this inventionis .the Provision of 21 main dir adjustment for the air to the mixing chamber which provides a positive control 0ver the air and is capable of varied adjustments to suit the carburetor to difletent engines.

A still further object oftl1is invention is the provision 0f an improved fuel jet t0 the mixing chamber which is so constructed and 0per'ates in connection witl1 the control mediums 0f the mixing chamber that the amount of fuel aclmitted to the mixing charmber will be increased und decreased with the opening and closing of the tlnottle valve.

With these an l other objects in view, this invention consists in certain novel features 0f construction. combination and arrangement of Parts t0 be hereinafter more fully described and clain1ed. l

For a complete -understanding 0f my invention, reference is t0 be had to the following desc1i ption and accompanying drawings, in which F igure 1 is a side elew1tion illustrating a carburetor constructecl in accorclance with n1y invention.

F igure 2 is a similar view showing the opposite side of the carburetor.

Figure 3 is a vertical showing view illustrating the carburetor.

Figure 4 is a sectional view taken 0n the line 44 of Figure 2.

F igure 5 is a similar view taken 0n the line 55 0f Figure 2.

Figure 6 is a detail sectional view illustrating a seat for slidable gate valves of the mixing chamber and also sh0wing the main air adjustment.

F igure 7 is a detail sectional view illustrating' the main air adjustment and its association with the fuel nozzle.

F igure 8 is a fragmentary plan v1ew 1llustrating the gate valves associated with the fuel nozzle and in a partly open position.

F igure 9 is a similar view showing the gate valves in substantially closed position 01' the position occupied during the idling 0f the engine.

Figure 10 is a view similar t0 Figure 9 wit-h the gate valves removed and showing the fuel nozzle. v

Figure 11 is a perspective view illustrating one of the gate valves.

F igure 12 is a detail sectional v1ew illustrating the adjustable double valve for one of tl1e air mediu1ns f the mixing chamber.

Figure 13 is a persp'ective view illustrating a frame constituting a portion of the double valve.

Figure 14 is a perspective vieW illustrat- .ing one of the' valve elements of the double form of a flat plate provicling a seat 4 t0 slidably s upport gate valves 5 which COD- trol er open and close the upper end of the chamber 2 which extends through the top plate.

An air intake cha1nber 6 forrns an integral part of'the base 1 and is in communication with one side 0f the chamber 2. The air charnber 6 is of substantially L-shape with its air receiving eml disposed uppermost and internally threa led t0 receive an adjnstable double control valve 7. A fnel cha1nber 8 is formed integral with the base 1 ancl isof tl1e conventional tyPe, that is employing a float control valve mechanism 9 for maintaining a desired amount of fuel therein at all times and receivable fro1n the usnal fuel supply tank. A tube er pipe 10 is rernovably secured t0 the base an l traverses the chambei 2 and has one end in cmnmmiiration with tl1e fucl chamber 8 an l supports a T- shaperl fuel jet 11 receiving fne1 from the fuel chamber 8. The. head porti0n 12 01? tl1e jet 11 is located within the opening of the top plate 0f tl1e base juse below the gute valves 5. The n-pper wall of the hcad 12 0f the fuel jet is slidably engaged by die gute. valves 5 ancl is provided with a series of openings 13 for permitting fnel to oscape from the jet. By referring t0 Fignre 3 it Will be seen that thc grate. valvos 5 control the openings 13 and when sai l gate valves are in their closed position all m the openings 13 are closed exrept tl1e intermediate opening which remains uncovered t'0 fnrnish suificient fuel for the engine'during idling speed.

The valve seat 4 01 t0p plate 0f the base is provided with a pair 0f spaco l groovos 14 to receive guide lugs 15 0f the. gate vulvcs 5 ancl by referring t0 Figure 10 it will be seen that the head 12 0f the T-shaped fnel jet is arranged in alignment with the grooves.

A mixing chamber 16 is 1nounted upon the base 1 01 top platze thereof and the lower end thereof has an integral plate 17 correspond ing in shape to the top platze of the base and proviclecl with marginal flanges 18 which have a tight fit with the top platze of the base.

T he marginal flanges 18 provide guides for the gate valves 5 tht1s it Will be seen that the gatevalve3 control both the fuel ancl air to the mixing chamber 16. The upper enrl 0f the mixing chamber 16 is flanged as shown at19 for attaching said mixing cha1nber to the usual intake manifold 0f an engine. Shafts 20 are journalled to the mixing ohnmber slightly belowlhe attaching flange 19 tliereof an'd carry semi-circular shaped disks or plates 121 'cooperat-ing with each other in providing a throttle valve. One of the plates has its straight edge concave While che Corresponding edge of the other plate is convex so that when said plates are moved in a position fOI. closing the upper end of the mixing chamber they have an overlapping connecti0n with each other and said edges 0f the plates are providecl with. notches 24 registering With each Other when the plates are in a position for closing die chamber 16 so that suflicient fuel rnay be sucked from t-l1e mixing cha1nber by the engine t0 maintain 'rhe engine running a1; idling speerl and 0bviates any possibility of the engine choking when operating at sairl i(lling speed due t0 the fact that suflicient fuel 1nay always be obtainerl. The shafts 20 are connected fogether by gears 22 and one of said shafts ia provi led with an arm 24 to whicl1 the uaual tl1rottle control is connectecl. By having the shafts connected by tl1e gears they move in unison in opposite directions by fhc throttle control. Arms 25 are a ljustably secured t0 the shafts 20 adjacentthe gears am] have pivotal and sliclable connection Willi the upper ends 0f pivotally mounted levers 26 and the lower ends of the levers rarry r0ds 27 fitting in slats 28 01 ears 29 formed integral With the gate valves 5 und \\'lli(ll (M's operate witl1in slots 30 forlned in the plate 17 m the mixing chamber. Thns it Will be scen that the gate valves move in unison with the throttle valve. It is to be unrlerstood that the mixing chamber 16 is detachably securml t0 the base in any desired manner and said mixing channber is surrounded by a jacket 31 for receiving a heatin; medinm for aiding in vaporizing fuel and mixing the latter with air within tl1e 1nixing chamber. 4

A plnrality 0f apertures 32 am formed in tl1e walls 01 the mixing chmnber 16 below thc throttle valve and provide an anxiliary air intake and are opened and closed bv an annnlar mvrnber 33 having openings 34. The annnlar member 33 has formed thereon a forked member 35 receiving a lug 36 carried b v one 0f the shafts 20 .for the purpose of operating the annular member during the operation of the throttle valve and also the gate valves. As the throttle valve is moved toward an open position, the annular member 33 ismoved to bring the apertures or openings 34 thereof in registration with the openings 32 t provide an additional amount A of air to the mixing chamber at high speeds 01' when the engine is operating at open throttle. B v this arrangement the amount 0f air admitted'to the mixing chaniber is increased -and lecreased as the throttle valve is opened F orarninous material 37 is dis and closed. posed over the openings 34 to prevent dirt and foreign matter from entering the mixing chamber.

The lug 36 is adjustably secured t0 its 1eis tape'red 0r provided with a conieal shaped Wall to provide a venturi 40 in alignment witl1 the chamber 2 of the base and disposecl over the gate valves 5 which control the passage of fuel and air into the mixing charnher by way of the venturi. T0 regulatethe siz e 0f the venturi, segmental shaped elements 41 are provided and are adjustable relative to each other b v set bolts 42. The segrnental elements 41 provide a positive means for varying the anmunt of fuel and air (hat may enter the n1ixing chamber and permits tl1is device to operate successfrilly on difl'erent sized engines.

The acljustable double control valve 7 inclurles a (rage 43 tlireaded 011 the mouth 0f the air chamber 6 and carries a briclge 44 slidably receiving a tubular sleeve 45 slidably mounted on asten1 46 carried by the chamber 6 and the sleeve 45 is screw threaded to receive adjusting nuts 47 engaging the upper iface of the bridge 44. A sleeve 48 is slidably rr'1'ounted on the sleeve 45 and is formed integral withthe valve element 49 'having seat1ng engagement with the cage 44 and normally urged in engagementtherewith by a coiled spring 50 bearing ag'ainst adjusting nuts'5l at one end while its opposit e and bears against a spider 52 carried by the sleeve 48. The adjusting nuts 51 permit the tension of the spring 50150 be varied'. The valve element 49 provide l with a series of openings53 c'l0sed by a valve element 54 slidabb mount= e(l on the sleeve 45. The valie element 54 is urged in engagement with the valve element 49 b v a coiled spring 55 which seats upon a support 56 carried by the sleeve 45. The strength =of the spring 55 is less than the strength of the spring 50 so that it requires less suction to unseat the valhe element 54 for opening the ports 01 openings 53 than it requires to unseat the valve element 49 from its seat on the cage 43. A stop 57 is t-hreaded t0 the sleeve 48 for limiting the amount the valve elen1ent 49 may be unseated and b adj usting the stop 5Tfon the sleeve 48 the amount which the valve olen1ent 49 may open can be easil v varied. The valve element 54 carries a headed stud for lin1iting the movement of said valve element 54 relative 10 the valve element 49. B v adjusting the nuts 47 on the sleeve 45. the tension of the spring 55 may be variecl.

During the operation of the device the valve elenient 54 is the first to open by the suction 0f the engine due to the strength 0f the spring 55 and as the suction 0f the engine increases, the valve elemont 49 is opened in aceordance Witl1 the amount of air in the chamber G, thus r it Will be Seen that an eilicientair control has been provided for the chamber 6 in aecordance With the amount of suct'ion received from the engine so that= as the suction of the engine increases the amount of air will be increased proportionately to insure a proper combustible mixture reaehing the engine under all working conclitions of the engine.

The adjacent edges of the gateS 5 are provided with notches 59 to prevent the entire cutting ofl: of the supply of fuel and air to the mixing chamber when said gates are in a closecl position along with the closing of the throttle valve. The notches 59 cooperate With each other in forming openings 0f Sufficient size to permit the proper amount of air and fuel t0 the mixing chamber 16 during the idling of the engine. It is to be understood (hat when the gate valves 5 are in closed position all of theapertures of the fuel nozzle are closed except one which supplies sufiicient fuel along with the air that may pass t-l1rough the notches of the gate valves to keep the engine operating at proper iclling speed.

In operation the opening 0f the thrott-le valve causes a simultaneous opening 0f the gate valves admitting air and fuel to the mixing chamber in proper portions and in accordar'1ce with the suction from the engine and the fu'el and air 'bec0me thoronghly n1ixed to form a veryhigh volatile mixture when entering the firing chambers of the engine and as the throttle valve moves toward an o'pen position, the annular member or control 33 is moved to admit an additional amount 0f air to the mixing chaxnber. This air enters the mixing chamber at right angles to the flow 0f air and fuel coming from the chamber 2 thereby bringing about a thorough agitation 0f the. fnel and air prior t0 entering the engine. Duo to the throttle valve being oonstructed fron1 segmental shaped plates or disks a thorough mixing of the fuel andair is caused by interrupting 0r changing the course 01 flow f the air f10111 the 1nixing cha1nber t0 the intake manifold of the engine. As tha tlnottle valve is opon the suc ti0n 0f the engine first opens ehe va1ve element 54 and as the suction 0f the engine increases by further opening 0f the throttle valve, the mlve element 49 beco1nes unseated admitting an additional amount 0f an, thus it will be scen that thc; ai1 admitted is in proportion t0 the suction 0f the engine and also tl1e fuel will be in roportion to the zimonnt of air obtained as the gute valves 5 adn1it more fuel as the th'rottle valve is opened. As the gate valves move toward an open position they crzlte a slight suction- 011 the head of the fuel jet t0 position sn1all particles of fuel 011 the head for an instant before being taken up by the suction 0f the engine thereby assuring a proper supply of fuel t0 the 1nixing ch2ln1ber when a quick acceloration 0f the engine is n1ade by a quick opcning of the throttle valve.

A device c0nstructed in accordance with the foregoing will rende1 a large saving in the consu1nption of fuel by delivering a combustible mixture t0 the engine in proper explosive condition, thus insurinq an increased power and a n1ore efiicient operating engine besides reducing t0 a n1inin'1um the accun1ulation of carbon and the dilution of the l'ubricant of the engine.

\Vhile I have shown und described the preferred embodiment 0f my invention, it will be nnderstood that minor changes in const-ruction, combination and arrangement 0f parts may be made without departing frorn the spirit and scope of my invention, as claimed.

Having thus described my invention what I claim is:

1. A carburetor cmnprising a base having an air chamber, a fue1 supply 1neans 0n the base, a mixing chamber semlred t0- the base and connected to an engine and having a vcnturi in connnunication with the air chan1- bar, an air supply 1neans f01 the chamber, a T-shaped nozzle located in the ai1 chamber and in communication with the fue1 snpply means and having a plurality of apertures locatad adjacent the venturi, a throttle valve in the 1nixing chamber. and gate valves in sliding contact with said T-shaped nozzle for 00ntrolling tho. fue1 fr01n the apertures and the air from the air charnbcr t0 the mixin,q chambor in proportions in acoordance with the positions occupied by the throttle valve and operating rneans between the throttle valvc and the gute valves to cause said valves to move in unison.

2. A carbnret-or comprising a base having an air chamber, a fuel supply means on th base, a mixing chamber connected t0 an engin0 and t0 the. base and haVing a venturi in communication with the air chamber, a T- shaped 110110W mernber connected to t-he fue1 supply means and located in the air cha1nber with the headed portion thereof located adjacent the "enturi. and provided with a 'series of openings t0 f0nn a plurality of fue1 jets, and air supply 1neans fo1 the air chambor, a throttle valve in the. mixing chan1ber, slidable gate valves 0n the baae in wiping contact with the 'T-shaped member for controlling the fuel jets und the assage of air fron1 the air chamber to the mixing chamber, and operating 1neans between the gate va1ves and tl1e throttle va1ve t0 cause said valves to move in unison.

3. A carburetor comprising a base having an air chamber, a fuel supply means 011 the base, a 1nixing chamber connected t0 an engine and'to the bas'e and having a venturi in communication with the air chamber a T- shaped hollow member connected t0 the fu0l supply rneans and located -in the air cha1nber wit-h the head portion thteof located adj acent the venturi and providod 'with a series 0f openings 130 form a plurality 0f fuel jecs, an air supply means for fl1e air chiunber, a throt-tle valve in the mixing Charnber, slidable gate valves 0n the basc' for mntrolling the fnel jets and the passage of air from the air chamber to the mixing chamber, operating 1neans between the gate x*alves and the th1otfle valve t0 canse. said valves t0 move in unison. and an auxilia'ry air suppl v means f01 the mixing chamber and mntrolled by the movernent-s 0f the throttle valve.

4. A carburvtor comprising a base having an air cha1nber, a fuel supply means an thc base, a n1ixing chan1ber connected t0 an engine and t0 the base and having a. venturi in communication with the air chan1ber, a T-shaped hollow member connected to the fue1 supply rneans and located in the air charnber with the head portion thereof located adjacent the ventnri anr1 provided with a series of openings t0 forma a. plurality of fuel jets, an air supply moans for the air chamber, a throttle valve in rhe mixing chamber, slidable gate valves 011 the base f0i controlling the fuel jets and the passage of air from the ai1 chamber t0 the mixing Chambe1. opefa'ing means between the gate valvos and the throttle valvc to cause said valves t0 move in unison, said mixing charnber having a plurality of air ports, a control men1ber for said ports und operated by themovements of tho thrott-le valve.

5. A carburetor comprising a base lmving an air chamber, a fuel supply means 0n che base, a mixing chamber connected 130 an engine and t0 the base and having a Vonturi in communication with th air chamber, a T shaped hollow mernber connected to the fuo1 supply rneans and located in t-l1o air chambor with the head portion thr-reof loca.ted adj acent the venturi and provided with a series 0f openings to form a plurality of fuel jets, an air supp1y means fo1 the air chamber, a

-in unison, said mixing chamber having a plurality of air Ports, zmd a c'ontrol member for said ports and operated by the movements of the thrbttle valve and a screen overlying the ports.

6. A c'arburetor comprising a. base having" an air chamber, a fuel supply means 011 the base, a mix1ng chamber connected to an eng1ne and t0 the base and hav1ng a ventun 111 communication with the air chamber a T- shaped hollow member connected to the fuel supply means and located in the air chamber with the head pdrtion thereof located adjacent the venturi ancl provided with a series of openings to forrn a plurality of fuel jets, an air supply means forthe air chamber, a throttle valve in the mixing chamber, slidable gate valves 0n the base for controlling the fuel jets and the assage of air from the air chamber to the mixing chamber, operat- 1ng means between the gate valves and the throttle valve to cause -said valves t0 move in unison said mixing chamber having a plurality of air ports, a control member for said ports and operated by the mowments of the throttle valve, a screen overlying the ports, and a jacket for-the mixing chamber to l'eceive a heating medium.

7. A carburetor comprising a base having.

an air charnber, a fuel supply means 011 the base a mixing chamber connected t0 an engine und to the base am] having a venturi in communication with the air chamber, an air supply means for the air chamber, a throttle valve in the mixing chamber, a T-shaped jet in communication with the fuel supply means and having a plnrality of apertures in the head portion and located adjacent the venturi gate valves slidable on the base for controlling the apertures 0f the jet and the passage of air from the air chamber to the mixing chamber, means for causing the gate valves t0 move in unison with the throttle valve, said gate valves having notches in their adjacent edges to permit one of the apertures of the jet to remain uncovered when said gate valves are in full closed position and t0 permit air to pass from the air chamber to the mixing chamber.

8. A carburetor comprising a base having an air chamber, a fuel supply means on the base, a mixing ehamber connected to an engim and to the base an'd having a venturi in communication with the air chamber, an air supply means for the air chamber, a throttle valve in the mi;zing chamber, a T-shaped jet in communication with the fuel supply means and having a plurality cf apertures in the head ortion and located adjakrent the venturi, gate -valves slidable on the base fr controlling the apertures of the jiet and the assage 0f air from the air chamber to the mixing chamber, means for causing the gate valves to move in unison with the throttle valve, said gate va'lv6s having notches in their adjacent edges to permit one of the apertures 0f the jet to remain un covered When siaid gate valwe s are in full closed osition and to per- 1nit air to pass from the air chamber to the mixing chamber, said throttle valve including pivotally. n1ounted semi-circular sh'aped plates and having notches in their adjacent edges to prevent completeclosure of the mixing chamber to the engindwhen said throttle valv6 is in a fully closed position.

9. A carburetor comprising a base having an air chamber, a fuel.supply means on the base, a mixing chamber connected to an engine and to the base and having a'venturi in communication with the air chamber, an air supply means for the air chamber, a throttle valve inthe mixing chamber, a T- shaped jet in communication with' the fuel supply means and having a plurality of apettures in the head ortion and located adjacent the venturi, gate valves slidable 011 the base f0r controlling the apertures of the jet and the passage ofair from the air chamber t0 the mixing chamber, means for causing the gate valves to move in unison with the throttle valve, said gate valves having notches in their adjacent edges t0 permit one of theapertures 0f the jet t0 remain uncovered when said gate valves are in fully closed osition andto permit air to pass from the air chamber t'o the mixing chamber, said throttle valve including pivotally mounted semi-circular shaped plates haaing notches in their adjacent edges to prerent complete closure of the mixing chamber to the engine when said throttle valve is in a fully closed position, one of said semi-circular plates having a coucave edge and the other semi-ci'rculai plate having a convex edge, said edges adapted to fit one within the other w-hen the throttle valve is in a closed position.

10. A carb'uretor comprising a, base having an air chamber, a fuel supply means on the base, a mixing chamber connected to an engine and to the base and having a venturi in communication with the air chamber, .air supply means f0r the air chamber a fuel nozzle in communication with the fuel supply means and located adjacent the venturi, gate "altes for controlling the assage of fuel from the nozzle to the mimfng chamber and air fromfihe air chamber to the mixing chamber, shafts journalled in the mixing chamber, gears connecting said shafts, semicircnlar plates carried by the shafts and cooperating with euch other to provide a throtlevers pivoted to the mixing chamber and pivotally and slidably connected to said arms, means connecting the levers to ehe gate valves to cause movement of the latter iniu1ison with the throttle valve.

11. A carburetor comprising a base having an air chamber, a fuel supply means 011 the base, a mixing cl1amber connected to an engine and to the base anal havlng a venturi in communication Wil1 the air cha1nber, ai1 supply means f01 the air chamber, a fuel nozzle in communication With the fuel supply means ancl located acljacent the venturi, gute valves for conolling -tl1e passage 0f fuel f10111 the nozzle t0 the mixing charnber anal a'1r f1'om the ai1 chamber t0 the mixing charmber, sl1afts journallecl in the mixing chax'nber, gears connecting said shafts, semi-circular plates car1iecl by the shafts ancl cooperating with each other to provide a throttle valve f0r the mixing chamber, means r'or connect ing one of the shafts to a control, arms adjustably securecl t0 said sl1afts, levers pivote(l t0 the mixing cl1amber und pivotally ar 1 l sliclably connected to sa id arms, means connec ting tl1e levers t0 the gate mlves to cause mowment 0f tha latter in unison with the throttle valve, an auxillary air'supply dev ice for the mixing chamber and having a forked ortion, anal a lug fitting in the 'Eorked pqrtion anc1 adjustably sccurecl t0 one of ehe shafts f0r causing operation 0f the auxiliary air supply device in accorclance with che movements of the throttle valve.

12. A carburetor comprising a base having an air chamber, a fuel supply means in the base, a mixing chamber adapted t0 be comnected t0 an engino ancl connectecl t0 the base and havlng a venturi in communica tion with the ai1 chamber, air supply means for th chamber, a fuel nozzle between the fuel chamber and tl1e venturi, a throttle valve in the mixing chamber, control means for controlling ai1 ancl fuel from the air chamber und nozzle respectively 130 the mixing chamber in proportions in accordance with the positions Occupied by the throttle valve, the Walls cf the venturi having oppositely disposed arcuate shaped grooves, segmental shaped elements slidable in the grooves for varying the size 0f the venturi, adjusting elements journalled in the Walls of the venturi and having threaded engagement with said segmental shaped elements for moving the latter toward and from each other, and means for locking the adjusting elements against rotation.

13. In a carburetor, a ventu1i, a fuel supply tube located therein and having a cross he2id providecl with jet openings, and oppositely disposed slidable gate valves to suc cessively close said openingsancl to vary the size of the venturi, said valves movable into abufting engagement and having notches in the abutting eclges thereof to permit one 0f the openings of the cross head 130 remain opened.

14. In a carburetor, a venturi, a fuel supply tube located therein and having a tubular cross head arrangecl radially of the venturi and l1aving jet openings, oppositely disposed slidable gate valves having movements which are parallel with the axis of the cross head, each 0f said valves having a centrally disposed notch adapted when the valves are closed t0 permit one of the jet openings to remain opened.

15. In a carburetor, a venturi, a fuel supply tub e located therein and having a tubular cross head arranged radially of the.venturi and having jet openings, oppositely disposed slidable gate valves having movements which are parallel With the axis of tl1e cross heacl, each 0f said valves having a centrally disposed notch adapted when the valves are closecl to permit one of the jet openings to remain 'openecl, said valves having notchas a1: the sides of the first mentioned notches to permit some air 130 enter the venturi when the valves are closed.

16. In a carburetor, a venturi, a fuel supply tube located therein and having a tubular cross l1ead arranged radially 0f the venturi and having jet openings, oppositely clis posecl sli lable. gute valves having movements which are parallel with the axis of the cross 9 heacl, each of said valves lxaving a centrally disposed notch adapted when the valves a1e closed to permit one 0f the jetopenings 130 remain opened, guide grooves formed radially in the Wall of said venturi, and guicles on said valves cooperating with said grooves to guide (ehe valves in said movemenls.

In testimony whereof I aflix my signature.

FREDERICK V. SCHAFFNER. 

